where \(c, \rho _0\) , and \(\gamma \)  are the speed of sound, density reference, and the polytropic constant, respectively. Note that \(\gamma = 7\)  is usually used for water simulations. The speed of sound \(c\)  is approximately \(\sqrt{100gH}\)  and it is chosen in respect of a low Mach number (\(Ma<0.1\) ) to ensure low compressibility effects [1]}.
